genetic epidemiology, statistical genetics, and bioinformatics

Welcome to the Genome Toolbox! I am glad you navigated to the blog and hope you find the contents useful and insightful for your genomic needs. If you find any of the entries particularly helpful, be sure to click the +1 button on the bottom of the post and share with your colleagues. Your input is encouraged, so if you have comments or are aware of more efficient tools not included in a post, I would love to hear from you. Enjoy your time browsing through the Toolbox.

## Friday, August 22, 2014

### Create Multiple Y Axes for an R Plot

R base graphics is a powerful tool for plotting data. Sometimes it is convenient to visualize combinations of variables on the same plot. Often different variables require different scales. This can be facilitated by using different Y axes, such as a plot with a Y 2 axis on the right hand side. In R adding a Y axis is very easy to do. Here are two simple example scripts you can use to build off of. The first two examples are two different ways of showing different scales for the same variable (i.e. temperature in Farenheit and Celsus). The third example is two different variables overlaid on the same R plot with two Y axes used to show the scales of each variable.

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